Fixed errors and improve roster tests

library/include/larra/client/client.hpp

@@ -80,21 +80,35 @@ struct Client {
 
   auto CreateResourceBind() -> boost::asio::awaitable<void> {
     SPDLOG_INFO("Send IQ: Set::Bind");
-    co_await this->Send(::iq::SetBind{.id = "1", .payload = ::iq::Bind{}});
+    co_await this->Send(::iq::SetBind{.id = "1", .payload = {}});
 
-    auto bind_result = co_await connection.template Read<::iq::ResultBind>();
+    auto set_bind_response = co_await connection.template Read<Iq<::iq::Bind>>();
-    jid.resource = std::move(bind_result.payload.jid->resource);
+    std::visit(utempl::Overloaded(
+                   [](auto error) {
+                     throw "Error response on IQ: Set::Bind: ''";  // TODO(unknown): Add exact error parsing
+                   },
+                   [&](::iq::ResultBind r) {
+                     jid.resource = std::move(r.payload.jid->resource);
+                     SPDLOG_INFO("Allocated resource: {}", jid.resource);
+                   }),
+               set_bind_response);
     co_return;
   }
 
   auto UpdateListOfContacts() -> boost::asio::awaitable<void> {
     SPDLOG_INFO("Send IQ: Get::Roster");
-    co_await this->Send(::iq::GetRoster{.id = "1", .from = ToString(jid), .payload = ::iq::Roster{}});
+    co_await this->Send(::iq::GetRoster{.id = "1", .from = std::format("{}@{}", "invalid_user", jid.server), .payload = {}});
 
-    const auto roster_result = co_await connection.template Read<::iq::ResultRoster>();
+    const auto get_roster_response = co_await connection.template Read<Iq<::iq::Roster>>();
-    roster = std::move(roster_result.payload);
+    std::visit(utempl::Overloaded(
-
+                   [](auto error) {
-    SPDLOG_INFO("New roster: {}", ToString(roster));
+                     throw "Error response on IQ: Get::Roster: ''";  // TODO(unknown): Add exact error parsing
+                   },
+                   [&](::iq::ResultRoster r) {
+                     roster = std::move(r.payload);
+                     SPDLOG_INFO("New roster: {}", ToString(roster));
+                   }),
+               get_roster_response);
     co_return;
   }
 

library/include/larra/iq.hpp

@@ -48,6 +48,19 @@ struct BaseImplWithPayload {
     S::Serialize(element->add_child_element(S::kDefaultName, S::kPrefix), self.payload);
   }
 
+  [[nodiscard]] static constexpr auto TryParse(xmlpp::Element* element) -> std::optional<BaseImplWithPayload> {
+    return [&] -> std::optional<BaseImplWithPayload> {
+      auto node = element->get_attribute("type");
+      if(!node) {
+        return std::nullopt;
+      }
+      if(node->get_value() != Name) {
+        return std::nullopt;
+      }
+      return Parse(element);
+    }();
+  }
+
   [[nodiscard]] static constexpr auto Parse(xmlpp::Element* element) -> BaseImplWithPayload {
     auto node = element->get_attribute("type");
     if(!node) {
@@ -78,6 +91,7 @@ struct BaseImplWithPayload {
             .payload = S::Parse(payload2)};
   }
 };
+
 static constexpr auto kGetName = "get";
 
 template <typename Payload>

library/include/larra/stream_error.hpp

@@ -73,6 +73,25 @@ struct ErrorImpl : BaseError {
   }
 };
 
+// Helper class to prevent parsing response stream into an expected return type if its name is a 'stream:error'
+struct UnknownXmppError : BaseError {
+  static constexpr auto kDefaultName = "stream:error";
+  static constexpr std::string_view kErrorMessage = "Unknown XMPP stream error";
+
+  static constexpr auto TryParse(xmlpp::Element* element) {
+    return std::optional{UnknownXmppError{}};
+  }
+  static constexpr auto Parse(xmlpp::Element* element) {
+    return TryParse(element).value();
+  }
+  friend constexpr auto operator<<(xmlpp::Element* element, const UnknownXmppError& obj) -> void {
+    throw std::format("'{}' must never be written into the real stream!", kErrorMessage);
+  }
+  [[nodiscard]] constexpr auto what() const noexcept -> const char* override {
+    return kErrorMessage.data();
+  }
+};
+
 struct BadFormat : ErrorImpl<BadFormat> {};
 struct BadNamespacePrefix : ErrorImpl<BadNamespacePrefix> {};
 struct Conflict : ErrorImpl<Conflict> {};
@@ -81,7 +100,7 @@ struct HostGone : ErrorImpl<HostGone> {};
 struct HostUnknown : ErrorImpl<HostUnknown> {};
 struct ImproperAdressing : ErrorImpl<ImproperAdressing> {};
 struct InternalServerError : ErrorImpl<InternalServerError> {};
-struct InvalidForm : ErrorImpl<InvalidForm> {};
+struct InvalidFrom : ErrorImpl<InvalidFrom> {};
 struct InvalidNamespace : ErrorImpl<InvalidNamespace> {};
 struct InvalidXml : ErrorImpl<InvalidXml> {};
 struct NotAuthorized : ErrorImpl<NotAuthorized> {};
@@ -109,7 +128,7 @@ using StreamError = std::variant<error::stream::BadFormat,
                                  error::stream::HostUnknown,
                                  error::stream::ImproperAdressing,
                                  error::stream::InternalServerError,
-                                 error::stream::InvalidForm,
+                                 error::stream::InvalidFrom,
                                  error::stream::InvalidNamespace,
                                  error::stream::InvalidXml,
                                  error::stream::NotAuthorized,
@@ -123,6 +142,7 @@ using StreamError = std::variant<error::stream::BadFormat,
                                  error::stream::UnsupportedEncoding,
                                  error::stream::UnsupportedFeature,
                                  error::stream::UnsupportedStanzaType,
-                                 error::stream::UnsupportedVersion>;
+                                 error::stream::UnsupportedVersion,
+                                 error::stream::UnknownXmppError>;
 
 }  // namespace larra::xmpp